US6459052B2 - Key unit and switch body and door switch using the same - Google Patents

Key unit and switch body and door switch using the same Download PDF

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Publication number
US6459052B2
US6459052B2 US09/851,413 US85141301A US6459052B2 US 6459052 B2 US6459052 B2 US 6459052B2 US 85141301 A US85141301 A US 85141301A US 6459052 B2 US6459052 B2 US 6459052B2
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US
United States
Prior art keywords
door
key
unit
push rod
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US09/851,413
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English (en)
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US20020006741A1 (en
Inventor
Hiroyuki Kajio
Takashi Niwa
Hidemitsu Takenaka
Yasuo Isa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omron Corp
Original Assignee
Omron Corp
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Filing date
Publication date
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Assigned to OMRON CORPORATION reassignment OMRON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISA, YASUO, KAJIO, HIROYUKI, NIWA, TAKASHI, TAKENAKA, HIDEMITSU
Publication of US20020006741A1 publication Critical patent/US20020006741A1/en
Application granted granted Critical
Publication of US6459052B2 publication Critical patent/US6459052B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
    • H01H3/161—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift for actuation by moving a closing member, e.g. door, cover or lid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H27/00—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings
    • H01H27/002—Switches operated by a removable member, e.g. key, plug or plate; Switches operated by setting members according to a single predetermined combination out of several possible settings wherein one single insertion movement of a key comprises an unlocking stroke and a switch actuating stroke, e.g. security switch for safety guards

Definitions

  • the present invention relates to a door switch for turning ON/OFF a contact as interlocked with the door opening and closing action and, more particularly to, a door switch used for a door provided at a doorway of a guard such as a protection fence or wall installed so as to surround a variety of machines.
  • a variety of machines such as machine tools, semiconductor manufacturing equipment and food processing machines are typically surrounded by a guard such as a protection fence or wall. The operator is prevented from inadvertently coming in contact with those machines in operation by the guard.
  • a doorway of such a guard is provided with a door for permitting the operator to enter for inspection and repair of the machines.
  • a door switch is equipped to such a door for turning OFF the contact in interlocked with the door opening and closing action to thereby cut off power for those machines.
  • a prior art door switch will be described with reference to FIGS. 6 and 7.
  • a guard is provided with a door 3 .
  • the door 3 can be opened and closed in an arrow direction between an opened position indicated by a solid line and a closed position indicated by a two-dots-and-dash line.
  • the door switch comprises a switch body 2 and a door key 7 .
  • the switch body 2 includes a built-in switch contact for turning ON/OFF power for the machine and also has a door key insertion hole 5 .
  • the switch body 2 is attached to the guard 1 with its door key insertion hole 5 as oriented toward a door 3 .
  • the door key 7 is provided to the door 3 in such a manner that it can be inserted into the door key insertion hole 5 when the door 3 is opened or closed.
  • the switch contact in the switch body 2 is in a power application state for the machines, in which they are in operation.
  • the door key 7 is pulled out of the door key insertion hole 5 . Then, the switch contact in the switch body 2 is switched to a state for cutting off power for the machines to stop them in operation.
  • Such a door key 7 is always protruded toward the door key insertion hole 5 irrespective of whether the door 3 is opened or closed. The operator is liable to come in contact with the door key 7 when he opens the door 3 to come into or go out of the guard 1 .
  • a door switch operates interlocked with the door opening and closing action and comprises a switch body and a key unit used as separated from the switch body, wherein the switch body includes a switch case having a door key insertion hole therein and a switch contact built in the switch case and the key unit includes a unit case, a door key which is provided in the unit case in such a manner that it can be protruded out and retreated into it, for switching the switch contact when inserted into the door key insertion hole, and a door key drive mechanism for, when pressed from the outside, protruding the door key from the unit case and, when released from the pressing, retreating the door key into the unit case.
  • the switch body is attached on one side of the door or a structure to which that door is mounted and the key unit, on the other side thereof.
  • FIG. 1 is a plan view for showing a guard and an important part of a door switch according to a preferred embodiment of the invention attached to a door of the guard;
  • FIG. 2 is an expanded perspective view for showing the door switch of FIG. 1;
  • FIG. 3 is an expanded perspective view for showing a key unit as exploded of the door switch of FIG. 2;
  • FIG. 4A is a vertical cross-sectional side view for showing a state of the door switch of FIG. 1 where a door is opened;
  • FIG. 4B is a vertical cross-sectional side view for showing a state of the door switch where the door is closed as against FIG. 4A;
  • FIG. 5A is a vertical cross-sectional side view for showing a state of a door switch according to another embodiment of the invention where the door is opened;
  • FIG. 5B is a vertical cross-sectional side view for showing a state of the door switch where the door is closed as against FIG. 5A;
  • FIG. 6 is a plan view for showing the guard and an important part of a prior art door switch attached to the door of the guard.
  • FIG. 7 is an expanded perspective view for showing the door switch of FIG. 6 .
  • a guard 1 which is one example of a fixed structure, is installed around machine tools, semiconductor manufacturing equipment, and other types of machines.
  • the guard 1 is shown in the drawings only at its wall which constitutes the surroundings of a doorway for those machines.
  • a door 3 is mounted at a doorway of the guard 1 so as to be opened and closed in an arrow direction between an opened position indicated by a solid line and a closed position indicated by a two-dots-and-dash line.
  • a door switch A comprises a switch body 2 and a key unit.
  • the switch body 2 is attached to an outer edge of the guard 1 , has a door key insertion hole 5 therein and includes a contact mechanism, not shown, for turning ON/OFF the power of the machines.
  • the key unit 4 is attached to a playing end side of the door 3 and includes a door key 7 .
  • the door key 7 is pulled out from the key insertion hole 5 in the switch body 2 , to thereby turn OFF the contact mechanism of the switch body 2 , thus cutting off the power for the machines to stop them in operation.
  • the door key 7 is retreated and housed in the key unit 4 by a door key drive mechanism described later. Since this mechanism thus prevents the door key 7 from protruding from the inside of the door 3 when the door 3 is opened, the operator can avoid coming in contact with the door key 7 inadvertently.
  • the switch body 2 comprises a body case 2 a and an operation case 2 b linked therewith on it.
  • the body case 2 a has a built-in contact mechanism, not shown, comprised of a switch contact and a plunger for turning ON/OFF this switch contact.
  • the operation case 2 b has a built-in contact drive mechanism, not shown, comprised of, e.g., a cam for turning ON/OFF the switch contact by driving the plunger of the contact mechanism.
  • the key insertion hole 5 into which the door key 7 is inserted.
  • the above-mentioned cam in the operation case 2 b is rotary-driven in a reverse direction. Then, the plunger in the body case 2 a is driven in a direction opposite to the above-mentioned one to thereby turn OFF the switch contact. This cuts off power for the machines and stops them in operation.
  • the above-mentioned contact mechanism utilized here is equipped with a forcedly contact opening mechanism for forcedly opening the switch contact.
  • a forcedly contact opening mechanism for forcedly opening the switch contact.
  • the key unit 4 houses the door key 7 in the unit case 6 and is equipped with a rocking link 8 , a push rod 9 , and a coil spring 10 .
  • the unit case 6 is made of a resin and box-shaped with its side opened.
  • the unit case 6 has at the rear end thereof an attaching portion 11 for being attached to the door 3 , an opening 12 through which the door key 7 is retreated and protruded in its lower part of the front thereof, a boss 13 for guiding the push rod 9 at its upper part of the front thereof, and a rod mounting hole 14 in the bottom of the boss 13 .
  • the door key 7 is formed by blanking a hard metal sheet such as a stainless steel sheet and by pressing it.
  • the door key 7 has a rectangular hole 7 a therein through which it is engaged with the above-mentioned contact drive mechanism built in the operation case 2 b of the switch body 2 , at the base of which is fixed a linkage member 15 by caulking.
  • the push rod 9 has a large-diameter head 9 a with a spring receiving flange at its front end and is inserted from the front side into the rod mounting hole 14 in the unit case 6 in a state where it is provided with the coil spring 10 .
  • the rocking link 8 is rotatably supported at its intermediate site by the unit case 6 via a support shaft 16 .
  • the lower part of the rocking link 8 is interlocked and linked with the linkage member 1 of the door key 7 via an elongated hole 17 and a linkage pin 18 .
  • the upper part of the rocking link 8 is interlocked and linked with the inner end of the push rod 9 via an elongated hole 19 and a linkage pin 20 .
  • a distance between the upper side linkage pin 20 and the support shaft 16 is set smaller than a distance between the lower side linkage pin 18 and the support shaft 16 .
  • This setting expands retreating and advancing distances of the push rod 9 , which are in turn converted into advancing and retreating distances of the door key 7 .
  • the push rod 9 , the coil spring 10 , the rocking link 8 , etc. make up in combination the door key drive mechanism for protruding the door key 7 from the unit case 6 when a pressure is applied from the outside and retreating it into the unit case 6 when the pressure is deactivated.
  • the push rod 9 constitutes a displacing mechanism such that it is retreated and displaced when pressed by the switch body 2 and advanced and displaced when released from the pressing.
  • the rocking link 8 is linked between the door key 7 and the push rod 9 for constituting a interlocking mechanism such that it advances the door key 7 out from the unit case 6 as interlocked with retreating of the push rod 9 and retreating the door key 7 into the unit case 6 as interlocked with advancing of the push rod 9 .
  • the key unit 4 is buried in and mounted on the playing end side of the door 3 in such a manner that the front of the unit case 6 thereof may be roughly flush with the inner surface of the door 3 .
  • the switch body 2 is linked with a key operation portion 21 at its upper part.
  • a recess 22 In the front of the key operation portion 21 is formed a recess 22 having a size permitting the insertion of the boss 13 provided as protruded out the front of the key unit 4 .
  • a protrusion 23 In the recess 22 is provided a protrusion 23 which can butt against the large-diameter head 9 a of the push rod 9 .
  • the boss 13 in the key unit 4 is inserted into the recess 22 of the key operation portion 21 . Accordingly, the door key 7 is held at the above-mentioned retreated position until the protrusion 23 in the recess 22 butts against the large-diameter head 9 a of the push rod 9 .
  • the protrusion 23 pushes in and displaces the large-diameter head 9 a of the push rod 9 with respect to the coil spring 10 .
  • the door key 7 is largely displaced forward by the rocking link 8 and inserted into the key insertion hole 5 in the switch body.
  • the contact drive mechanism of the operation case 2 b drives the contact mechanism of the body case 2 a to thereby turn ON the switch contact. Then, the machines enter a power-applied state and start operation.
  • the door key 7 can be smoothly inserted into and pulled out from the door key insertion hole 5 even if it is not arranged at the playing end of the door 3 which has a large opening radius in particular, thus being relaxed in restrictions on its installation position.
  • the door key 7 can be arranged, for example, near the base end where the operator of the door 3 hardly comes in contact with it.
  • the boss 13 protruded out the unit case 6 may be made of hard rubber with an appropriate elasticity so that it may be prevented from being damaged when it comes in contact with other objects.
  • the push rod 9 may be provided as buried in the unit case 6 . In this case, when the door is open, not only the door key 7 but also the push rod 9 may not come in contact with other objects.
  • the protrusion 23 may be made of an elastic material such as hard rubber in case it may protrude to the switch body 2 or the guard 1 to come in contact with the operator or any other object.
  • the door key 7 may have a snap action construction, whereby when the push rod 9 is pressed and displaced even slightly by the protrusion 23 , the door key 7 may be instantaneously protruded out from the key unit.
  • the above-mentioned door key drive mechanism has been described as a mechanical one, it may be such an electrical mechanism that a proximity sensor detects that the door 3 has been completely or mostly closed, and in response to that detection the door key 7 is protruded out from the key unit 4 .
  • This invention can be applied not only to the rocking opening/closing type but also to sliding opening/closing type of the door 3 .
  • the door 3 or the wall surface of the guard 1 may act also as at least part of the unit case 6 of the key unit 4 so that the components in the unit case 6 can be contained in the housing portion formed at the door 3 or the guard 1 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Push-Button Switches (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Transmitters (AREA)
  • Keying Circuit Devices (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Mechanisms For Operating Contacts (AREA)
US09/851,413 2000-05-12 2001-05-09 Key unit and switch body and door switch using the same Expired - Fee Related US6459052B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2000139597A JP3941337B2 (ja) 2000-05-12 2000-05-12 ドアスイッチ
JP2000-139597 2000-05-12

Publications (2)

Publication Number Publication Date
US20020006741A1 US20020006741A1 (en) 2002-01-17
US6459052B2 true US6459052B2 (en) 2002-10-01

Family

ID=18647019

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/851,413 Expired - Fee Related US6459052B2 (en) 2000-05-12 2001-05-09 Key unit and switch body and door switch using the same

Country Status (6)

Country Link
US (1) US6459052B2 (de)
EP (1) EP1160811B1 (de)
JP (1) JP3941337B2 (de)
AT (1) ATE298924T1 (de)
CA (1) CA2347144C (de)
DE (1) DE60111684T2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070039806A1 (en) * 2005-08-22 2007-02-22 Scientific Technologies Incorporated Safety Lock for Interlock Switch
USD742840S1 (en) * 2013-11-13 2015-11-10 Rockwell Automation Technologies, Inc. Industrial control
US20240384590A1 (en) * 2021-07-02 2024-11-21 Panasonic Intellectual Property Management Co., Ltd. Fixture, actuator with fixture, and detection switch

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPN20010089A1 (it) * 2001-12-19 2003-06-19 Electrolux Zanussi Elettrodome Elettrodomestico, in particolare lavastoviglie, con porta di accesso perfezionata.
FR2839191A1 (fr) * 2002-04-25 2003-10-31 Gunnebo Troax Ab Procede de verrouillage d'une porte d'enceinte industrielle et dispositif de verrouillage correspondant
EP1827650A4 (de) * 2004-11-30 2013-02-20 Alpha Technologies Corp Ltd Verbesserte sterilisationsfilteranordnung, vorrichtung und verfahren
JP4967723B2 (ja) * 2007-03-08 2012-07-04 オムロン株式会社 操作キーカバー
DE102009037349B4 (de) * 2009-08-14 2012-02-02 K.A. Schmersal Holding Gmbh & Co. Kg Vorrichtung zum Überwachen eines Zustandes einer sicherheitsrelevanten Einrichtung
JP5108129B2 (ja) * 2011-04-13 2012-12-26 ファナック株式会社 衝突防止機能を有するスイッチ装置
DE102012005210B4 (de) * 2012-03-16 2022-09-29 Brühl Safety GmbH Schutzzaunsystem
US10250813B2 (en) * 2014-09-03 2019-04-02 Fuji Xerox Co., Ltd. Methods and systems for sharing views
US9650142B2 (en) 2015-02-24 2017-05-16 Panasonic Intellectual Property Management Co., Ltd. Monitor device driven to move in response to detection by switch
WO2020065949A1 (ja) * 2018-09-28 2020-04-02 株式会社Ｆｕｊｉ ガイド付き安全扉

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924085A (en) * 1974-03-18 1975-12-02 Gen Electric Safety-start device and circuit controller for domestic appliance
US5662212A (en) * 1994-10-11 1997-09-02 Hans Bernstein Spezialfabrik Fur Schaltkontakte Gmbh & Co. Radius actuator for a safety switch
US5744767A (en) * 1995-10-13 1998-04-28 Hans Bernstein Spezialfabrik Fur Schaltkontakte Gmbh & Co. Radius actuator with adjustable slanted disposition of an operating key for operation of a safety switch
US5918731A (en) * 1998-01-26 1999-07-06 Hans Bernstein Spezialfabrik Fur Schaltkontakte Gmbh & Co. Radius actuator for safety switches
US6268574B1 (en) * 1999-04-29 2001-07-31 Rudolph R. Edens Electrical and pneumatic lock-out device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1503327A (en) * 1975-10-01 1978-03-08 Unimax Switch Ltd Electrical switches
US4465997A (en) * 1981-01-26 1984-08-14 Security Network International, Inc. Exterior mounted door and window alarm switch
FR2655183B1 (fr) * 1989-11-27 1992-02-21 Telemecanique Appareil interrupteur de securite a cle.
FR2655185B1 (fr) * 1989-11-27 1992-02-21 Telemecanique Appareil interrupteur de securite fonctionnant par insertion et extraction d'une cle.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3924085A (en) * 1974-03-18 1975-12-02 Gen Electric Safety-start device and circuit controller for domestic appliance
US5662212A (en) * 1994-10-11 1997-09-02 Hans Bernstein Spezialfabrik Fur Schaltkontakte Gmbh & Co. Radius actuator for a safety switch
US5744767A (en) * 1995-10-13 1998-04-28 Hans Bernstein Spezialfabrik Fur Schaltkontakte Gmbh & Co. Radius actuator with adjustable slanted disposition of an operating key for operation of a safety switch
US5918731A (en) * 1998-01-26 1999-07-06 Hans Bernstein Spezialfabrik Fur Schaltkontakte Gmbh & Co. Radius actuator for safety switches
US6268574B1 (en) * 1999-04-29 2001-07-31 Rudolph R. Edens Electrical and pneumatic lock-out device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070039806A1 (en) * 2005-08-22 2007-02-22 Scientific Technologies Incorporated Safety Lock for Interlock Switch
US7442888B2 (en) * 2005-08-22 2008-10-28 Scientific Technologies Incorporated Safety lock for interlock switch
USD742840S1 (en) * 2013-11-13 2015-11-10 Rockwell Automation Technologies, Inc. Industrial control
US20240384590A1 (en) * 2021-07-02 2024-11-21 Panasonic Intellectual Property Management Co., Ltd. Fixture, actuator with fixture, and detection switch

Also Published As

Publication number Publication date
EP1160811A2 (de) 2001-12-05
JP3941337B2 (ja) 2007-07-04
EP1160811B1 (de) 2005-06-29
US20020006741A1 (en) 2002-01-17
JP2001319549A (ja) 2001-11-16
DE60111684D1 (de) 2005-08-04
DE60111684T2 (de) 2006-05-18
CA2347144A1 (en) 2001-11-12
CA2347144C (en) 2005-04-12
ATE298924T1 (de) 2005-07-15
EP1160811A3 (de) 2003-02-05

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